Part of Oral Answers to Questions — Civil Aviation – in the House of Commons at 12:00 am on 29 June 1949.
Yes, Sir. There were unusually severe delays to aircraft movements at Northolt during a spell of instrument flight rule conditions on 14th June, the day after new procedures were introduced in the Metropolitan control zone. Advantage has been taken of the experience gained in instrument flight rule conditions since the system was inaugurated to introduce certain modifications, and this process will continue as necessary.